Move about://-related constants from //content to //url

chrome/browser/history/history_service.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // The history system runs on a background thread so that potentially slow
 // database operations don't delay the browser. This backend processing is
 // represented by HistoryBackend. The HistoryService's job is to dispatch to
 // that thread.
 //
 // Main thread                       History thread
@@ skipping 953 matching lines @@
       url.SchemeIs(content::kChromeDevToolsScheme) ||
       url.SchemeIs(content::kChromeUIScheme) ||
       url.SchemeIs(content::kViewSourceScheme) ||
       url.SchemeIs(chrome::kChromeNativeScheme) ||
       url.SchemeIs(chrome::kChromeSearchScheme) ||
       url.SchemeIs(chrome::kDomDistillerScheme))
     return false;
 
   // Allow all about: and chrome: URLs except about:blank, since the user may
   // like to see "chrome://memory/", etc. in their history and autocomplete.
-  if (url == GURL(content::kAboutBlankURL))
+  if (url == GURL(url::kAboutBlankURL))
     return false;
 
   return true;
 }
 
 base::WeakPtr<HistoryService> HistoryService::AsWeakPtr() {
   DCHECK(thread_checker_.CalledOnValidThread());
   return weak_ptr_factory_.GetWeakPtr();
 }
 
@@ skipping 182 matching lines @@
   DCHECK(thread_checker_.CalledOnValidThread());
   visit_database_observers_.RemoveObserver(observer);
 }
 
 void HistoryService::NotifyVisitDBObserversOnAddVisit(
     const history::BriefVisitInfo& info) {
   DCHECK(thread_checker_.CalledOnValidThread());
   FOR_EACH_OBSERVER(history::VisitDatabaseObserver, visit_database_observers_,
                     OnAddVisit(info));
 }